should tug
Verbo regular: tug - tugged- tugged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd tug
you'd tug
he'd tug
we'd tug
you'd tug
they'd tug 	I'd be tugging
you'd be tugging
he'd be tugging
we'd be tugging
you'd be tugging
they'd be tugging	I should've tugged
you should've tugged
he should've tugged
we should've tugged
you should've tugged
they should've tugged	I should've been tugging
you should've been tugging
he should've been tugging
we should've been tugging
you should've been tugging
they should've been tugging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't tug
you shouldn't tug
he shouldn't tug
we shouldn't tug
you shouldn't tug
they shouldn't tug 	I shouldn't be tugging
you shouldn't be tugging
he shouldn't be tugging
we shouldn't be tugging
you shouldn't be tugging
they shouldn't be tugging	I shouldn't have tugged
you shouldn't have tugged
he shouldn't have tugged
we shouldn't have tugged
you shouldn't have tugged
they shouldn't have tugged	I shouldn't have been tugging
you shouldn't have been tugging
he shouldn't have been tugging
we shouldn't have been tugging
you shouldn't have been tugging
they shouldn't have been tugging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I tug?
should you tug?
should he tug?
should we tug?
should you tug?
should they tug? 	should I be tugging?
should you be tugging?
should he be tugging?
should we be tugging?
should you be tugging?
should they be tugging? 	should I have tugged?
should you have tugged?
should he have tugged?
should we have tugged?
should you have tugged?
should they have tugged? 	should I have been tugging?
should you have been tugging?
should he have been tugging?
should we have been tugging?
should you have been tugging?
should they have been tugging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I tug?
shouldn't you tug?
shouldn't he tug?
shouldn't we tug?
shouldn't you tug?
shouldn't they tug? 	shouldn't I be tugging?
shouldn't you be tugging?
shouldn't he be tugging?
shouldn't we be tugging?
shouldn't you be tugging?
shouldn't they be tugging? 	shouldn't I have tugged?
shouldn't you have tugged?
shouldn't he have tugged?
shouldn't we have tugged?
shouldn't you have tugged?
shouldn't they have tugged? 	shouldn't I have been tugging?
shouldn't you have been tugging?
shouldn't he have been tugging?
shouldn't we have been tugging?
shouldn't you have been tugging?
shouldn't they have been tugging?